Ginger turned out to be a therapy cat for him and took to him immediately and was strictly "his" cat. She only went to him, paid attention to him, etc. The other kitten became "my" cat, Lumpy. When he passed away a year ago, Ginger went through a period of mourning. She always slept on a pillow with him at night and after he passed she refused to even go in the bedroom.
I tried to show her as much attention as she would allow and eventually, about 9 months later she would come in the bedroom. She then began coming to her pillow and now sleeps with me. It took a lot for her to get over him, but she is doing fine now. She wants to be with me all the time now. Of course, Lumpy gets a little jealous and we have a few issues over who was on the bed first. Animals too feel things and I was worried she would get sick over his passing. You just have to show them extra love and care.